. State whether each of the following samples of matter is a gas. If there is not enough information for you to decide, write "insufficient information."
(a) A material is in a steel tank at 100 atm pressure. When the tank is opened to the atmosphere, the material suddenly expands, increasing its volume by 10%.
(b) A 1.0-mL sample of material weighs 8.2 g.
(c) The material is transparent and pale green in color.
(d) One cubic meter of material contains as many molecules as 1.0 m3 of air at the same temperature and pressure.

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